02-03-2009, 08:01 PM | #1 |
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PDF DRM how do you know?
How does one know whether a PDF file has DRM?
Gunner... |
02-03-2009, 08:38 PM | #2 |
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If you can open the PDF in Adobe Reader, go to Document Properties, security tab and look at "Security Method" if it says anything besides "No Security", it is encrypted (and DRM protected) using the named Security handler. Note: Adobe currently provides 4 security handlers (Password, Certificate, Live Cycle, and eBooks), and there are a multitude of 3rd party security handlers.
If you cannot open it in Adobe Reader, assuming it is a valid non corrupt PDF file, it is probably DRM protected. If people are interested, I can give the true Geek answer of how to walk the PDF structure in a text editor to find out all of this information. |
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02-03-2009, 09:10 PM | #3 |
Enjoying the show....
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02-04-2009, 03:53 AM | #4 |
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If you're asking how you can tell at the time you buy the book, it will, if it has DRM, generally be described as "Secure PDF" in the eBook store.
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02-04-2009, 03:46 PM | #5 |
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02-05-2009, 03:58 AM | #6 |
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Use "pdfinfo", it comes with poppler in my linux:
Code:
$ pdfinfo dantesinferno00dantuoft.pdf Producer: Recoded by LuraDocument PDF v2.28 CreationDate: Thu Dec 6 09:34:21 2007 ModDate: Thu Dec 6 10:11:03 2007 Tagged: no Pages: 372 Encrypted: no Page size: 640 x 912 pts File size: 37026003 bytes Optimized: yes PDF version: 1.5 Last edited by Jellby; 02-05-2009 at 04:00 AM. |
02-07-2009, 11:13 AM | #7 |
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Thanks to all!
Gunner... |
12-11-2011, 11:18 AM | #8 |
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is there a way you guys can remove the 5 pictures you guys have as part of your profile? its annoying to have to scroll through so much white space in order to read the next post....
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12-11-2011, 11:24 AM | #9 |
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What 5 pictures? Do you mean the avatars? If so, the answer is no. But you can turn off seeing avatars in your profile. You'll have to go look it up for yourself. I'm not doing it for you with that attitude.
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12-11-2011, 11:27 AM | #10 | |
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Quote:
Alternatively, you could go into your Control Panel, select "Edit Options", and in the "Thread Display Options" section, uncheck the "Show Avatars" box. |
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12-11-2011, 11:49 AM | #11 |
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A little late in the reply, but I lost the thread until it got bumped
Open the file in a text editor. Search for "/Encrypt" - If you don't find it then your PDF is not encrypted If you find it then you are most likely in the "Trailer" dictionary which is at the end of the file. There should be entries that look like: /Root 74 0 R /Encrypt 96 0 R /Info 1 0 R These specify which objects are the import one in the file. To find a object search replace the R with an 'obj' and search (most likely backwards) in the file. So if I was searching for the Encryption Dictionary in the above example, I would search for "96 0 obj" Which would get you something like 96 0 obj << /Filter /Standard /V 2 /R 3 .... >> The interesting bit is the value for /Filter - in this case it is /Standard meaning the file uses the 'Standard' security handler which is Password Protection. Last edited by Jim Lester; 12-11-2011 at 04:36 PM. |
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